The regex code in Webkit 2.4.11 allows remote attackers to cause a denial of service (memory consumption) as demonstrated in a large number of ($ (open parenthesis and dollar) followed by {-2,16} and a large number of +) (plus close parenthesis).
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwebkit2gtk-4.0-37-gtk2-dbgsym": "2.16.1-0ubuntu0.16.04.1", "gir1.2-webkit2-4.0": "2.16.1-0ubuntu0.16.04.1", "libwebkit2gtk-4.0-dev": "2.16.1-0ubuntu0.16.04.1", "libjavascriptcoregtk-4.0-18-dbgsym": "2.16.1-0ubuntu0.16.04.1", "libjavascriptcoregtk-4.0-dev": "2.16.1-0ubuntu0.16.04.1", "gir1.2-javascriptcoregtk-4.0": "2.16.1-0ubuntu0.16.04.1", "libwebkit2gtk-4.0-37-gtk2": "2.16.1-0ubuntu0.16.04.1", "libjavascriptcoregtk-4.0-18": "2.16.1-0ubuntu0.16.04.1", "libjavascriptcoregtk-4.0-bin-dbgsym": "2.16.1-0ubuntu0.16.04.1", "libwebkit2gtk-4.0-doc": "2.16.1-0ubuntu0.16.04.1", "libwebkit2gtk-4.0-37": "2.16.1-0ubuntu0.16.04.1", "libwebkit2gtk-4.0-37-dbgsym": "2.16.1-0ubuntu0.16.04.1", "libjavascriptcoregtk-4.0-bin": "2.16.1-0ubuntu0.16.04.1" } ] }